Jan Gehring > Rex-1.4.1 > Rex::Transaction

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Module Version: v1.4.1   Source   Latest Release: Rex-1.4.1_02

NAME ^

Rex::Transaction - Transaction support.

DESCRIPTION ^

With this module you can define transactions and rollback scenarios on failure.

SYNOPSIS ^

 task "do-something", "server01", sub {
   transaction {
     on_rollback {
       rmdir "/tmp/mydata";
     };
 
     mkdir "/tmp/mydata";
     upload "files/myapp.tar.gz", "/tmp/mydata";
     run "cd /tmp/mydata; tar xzf myapp.tar.gz";
     if($? != 0) { die("Error extracting myapp.tar.gz"); }
   };
 };

EXPORTED FUNCTIONS ^

transaction($codeRef)

Start a transaction for $codeRef. If $codeRef dies it will rollback the transaction.

 task "deploy", group => "frontend", sub {
    on_rollback {
      rmdir "...";
    };
    deploy "myapp.tar.gz";
 };
  
 task "restart_server", group => "frontend", sub {
    run "/etc/init.d/apache2 restart";
 };
  
 task "all", group => "frontend", sub {
    transaction {
      do_task [qw/deploy restart_server/];
    };
 };

on_rollback($codeRef)

This code will be executed if one step in the transaction fails.

See transaction.

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